With Jayson Tatum in the midst of one of arguably his best season of his career coming off a championship, he looks like a guy playing with a chip on his shoulder. In an interview with NBC Sports Boston before Friday’s game against the Suns,Paul Pierce elaborated on where he thinks that motivation is coming from. “When I watch Tatum on and off the court, he’s humble, he works hard,” Pierce said. “I have a chance to watch him workout in LA every year, he loves the game. He has something to play for because he’s probably the most disrespected superstar in our league.”